Developing-tank.



I. A. BELL.

DEVELOPING TANK.

APPLICATION FILED FEB. 27, .1912.

1,044,433, Patented Nov. 12, 1912.

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DEVELOPING TANK,

APPLICATION FILED r3327, 1912v 1,044,433, Patented Nov. 12, 1912.

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ISAAC A. BELL, OF CHICAGO, ILLINOIS.

DEVELOPING*TANK.

Specification of Letters Patent.

Application filed February 27, 1912. Serial Ito. 680,188.

To all whom it may concern;

Be it known that I. ISAAC A. BELL, a citizen .ot' the United States,residing at Chi: cage, in the county of Cook and State ot Illinois, haveinvented new and useful Iniprovements in Developing-Tanks, of whlch thefollowing is a specification.

The invention relates to photography, and has for, {in-object to providea tank for developing roll films. i

The invention embodies more particularly a device adapted. to receivethe film roll and arranged Within a tank, with means for unwinding thefilm from the roller and passing the same through the tank to expose thefilm to the developing action of the fluid conmined in the tank.

In the further disclosure of the invention, reference is to be had tothe accompanying drawings forming a part of this specification, in Whichsimilar characters of reference denote corresponding parts in each ofthe views, and in which,

Figure 1 is a perspective view of the tank. Fig. 2 is a plan View withthe cover removed. Fig. 3 is a vertical transverse sectional view takenon the line of Fig. 1. Fig. 4 is avertical sectional view taken on theline :l-et of Fig. 3. Fig. 5 is a horizontal sectional View taken on theline 5-5 of Fig. 1. Fig. (3 is a perspective view of the holder.

Referring more particularly to the views, use is made of av holder 10for insertion in a tank body 11 provided with a cover 12, the holder 10consisting of a frame 13 having guide bars 14 forming standards, apartition 15 being interposed between the guide bars 14-. Secured to theupper ends of the guide bars 11 is a head 16, the partition 15terminating at the upper end in the mentioned head 16. The lower end ofthe partition 15 is spaced a distance from the lower ends of the guidebars 14:, and mounted adjacent the lower end of the partition is aroller 17 The head 10. is provided with an inclined longitudinallyextending slot 18, through which the film is adapted to pass, as will behereinafter more fully disclosed, and for this reason, the sides of theslot 18 are preterably covered with pieces of rubber cloth 19, as shown,thus preventing the emulsion on the film from becoming scratched orotherwise injured, when the film is drawn through the slot 18.Apassage-QO is formed in the head 16, and a cord 21 is passed PatentedNov. 12, 1912.

through the passage, the said cord being then passed downwardly around aroller 17 and terminating at one end in a chamber 22, the other end ofthe cord being arranged to freely depend exterioriy of the head 16.

T he tank 11 is elongated in form and is enlarged at the upper endthereof to form a head 23. a plurality of tubular cars 24 being formed.on the head 23 on opposite sides thereof, with the inner ends of theears terminating in curved passages 25 formed between inner walls 26 andouter walls 27015 the head 23,.the entrances of the mentioned earsconstituting filling openings, and the mentioned passages being curved,so that rays of light will be prevented from passing or being reflectedinto the tank 11. By referring to Fig. 3, it will be seen that the upperend of the head 23 of the tank 11 forms a base or support for the headlfiof the holder 10, andthe cover 12 is adapted to be secured to thehead 23 to inclose a film roll 28 mounted upon the head 16 ofthe holder10, suitable hooks 29 being mounted to swing on the head 23 and adaptedto engage pins 30 secured to the cover 12, thus locking the cover 12tothe tank body 11, the joint between the cover and the tank body being soarranged that rays of light will be prevented from passing within thetank body or cover.

In the use of the device described, when it is desired to develop theroll 28, the usual roller of the film roll is mounted upon the head 16of the holder 10, and the black passed through the slot 1-8, the end ofthe mentioned strip being then pulled downwardly to unwind the film fromthe film roll. until the edge of the first film is in position to passtl'irough the slot. The clamp 22 is then secured to the mentioned strip,and the holder is then mounted inthe tank body 11, after which the cover12 is mounted. in position, as shown, and secured by the hooks 29engaging the locking pins 30. The developing solution is then pouredinto the tank body through one of the filling openings formed bv one ofthe ears 24, and the fluid passing tl'irough. the curved passage' flbwill flow into the tank body and partially fill the same. The exteriorlydepending end of the cord 21 is then grasped and by pulling thereon thefilm will be drawn from the roller of the film roll and pulleddownwardly around the roll 17 of the holder 10. It will thus be seenthat the entire film will be exposed to the developing action of thefiuid in the tank body, and when the exposure of the film in thementioned developing solution has been sufiicient to properly developpictures, the tank body is tilted to permit of pouring the developingsolution therefrom, the mentioned solution being adapted to flowoutwardly through one of the passages 25 formed in the head of the tankbody, and thence outwardly through one of the cars 24. Clear water isthen poured into the tank and by slightly shaking the tank body, thewater will cleanse the film and remove any of the acid or developingsolution that may still be upon the film, after which if the film hasbeen sufiiciently cleansed, the cover 12 is removed from engagement withthe tank body and the developed film is taken therefrom by firstwithdrawing the holder 10 from the tank body 11 and then removing thefilm from the holder, after which the film is plunged into the fixingbath, thus completing the developing operation.

With the device of the character described, it will be seen that thefilm can be developed in day-light, thus obviating the necessity offirst entering a dark room or the like, in order to position the filmfor the purpose of developing the same, the film being also removablefrom the tank in day-light, for the purpose of transferring the film tothe fixing bath to complete the developing process. It will be furtherseen that the device described is compact in form, and simple inconstruction, and the mentioned device can be conveniently carried inthe pocket.

It will be readily understood that the device described can be made invarious forms and sizes, Without departing from the spirit of theinvention, and it will be further understood that I do not limit myseltto the particular ,construetion disclosed in the drawings ind cdescrihed in the specification,

the scope of the invention being defined in the appended claims.

What is claimed is: I

1. In a developing tank, the combination with a tank body, of a headformed on the tank body and provided with curved passages terminating infilling openings to permit of pouring a developing fluid into said tankbody, a holder for removable insertion within the tank body and adaptedto receive a film roll, means mounted exteriorly of the said tank bodyand extending Within the same to grip the film and unwind the same fromthe roller thereof and to expose the film to the developing action ofthe fluid in the said tank, and a cover for connection with the saidtank body and adapted to inclose the said film roll.

2. In a developing tank, the combination with a tank body, of a holderfor removable insertion in the said body, said holder comprising aplurality of guide bars, and a partition interposed between the saidguide bars, a roller mounted at one end of the said guide bars, a headsecured to the other end of the guide bars and adapted to receive a filmroll, a cover for the said tank body and adapted to inclose the filmroll, and means mounted exteriorly of the tank body and extendingtherein to grip the film roll and unwind the same from the rollerthereof.

3. In a developing tank, the combination with a tank body, of a holderfor removable insertion in the said body, said holder com prising aplurality of guide bars, and a partition interposed between the saidguide bars, a roller mounted at one end of the said guide bars, a headsecured to the other end of the guide bars and adapted to receive a filmroll, a cover for the said tank body and adapted to inclose the filmroll, and a cord mounted exteriorly of the tank body and extendintherein to grip the film roll and unwind t e same from the rollerthereof.

Intestimony whereof I afiz: my signature in presence of two Witnesses.

P. G. MEAHL,' O. HENnIKsnN.

